一．名词在句子中的作用
1）做主语
Knowledge is power.
2)做表语
Smoking is my only weakness.
3)做宾语
Do you get my fax?
4）做同位语
You girls sit on this side.
This is our department head, Dr.Owen.
二．.四类名词从句
A主语从句
The book is interesting. →What I’m reading is interesting.
B宾语从句
I believe his words.→ I believe what he said.
C表语从句
English is a useful tool. → The book is what I want.
D同位语从句.
I like the book,gone with the wind.→ The mother must accept the fact that her baby is deaf.
三.主语从句
1.三种句型充当句子成分
四.主语从句例句
What he wants to tell us is not clear.
Who will win the match is still unknown.
It is known to us how he became a writer.
Where the English evening will be held has not yet been announced.
A.由That引导的主语从句
常用句型如下：
（1）It + be + 名词+ that从句
It’s a pity that he can’t swim.
It is a fact that...
It is no wonder that...
It is a shame that....
（2）It + be + 形容词+ that从句
It is strange that he knows nothing about it.
It is clear that...
It is possible that...
It is likely that...
It is necessary that...
（3）It + be + 动词的过去分词+ that从句
It is said that there has been an earthquake.
It is reported that...
It is believed that...
It is generally thought that...
（4）It + 不及物动词+ that 从句
It seems that you’re right.
B.一般疑问句做主语从句
C.特殊疑问句做主语从句
1.特殊疑问句变成陈述句语序，而不用倒装语序。Why he refused to cooperate with us is still a mystery.
